Pneumatic spring or cushion.



Patented Dec. 25, I900.

s. u. srusas. PNEUMATIC SPRING 0R CUSHION:

. (Application filed Aug. 27, 1900.) (No Ilodal.)

2 Smash-Sheet" l.

No. 664,444; Patented 1m. 25, 1900. s. u. STUBBS.

PNEUMATIC SPRING 0R CUSHION.

(Application filed Aug. 27, 1900.j:

- 2 Shear-Sheet 2.

UNITED STATES PATENT OFFICE.

SHELDON HAROLD STUBBS, OF MANCHESTER, ENGLAND.

PNEUM ATICSPRING OR CUSHION.

SPECIFICATION forming part of Letters Patent No. 664,444, dated December25, 1900.

Application file August 27,1900. Serial No. 28,237. (No model.)

To a whom it may concern: Be it known that I, SHELDON HAROL STUBBS, asubject of the Queen of Great Britain, residing at Manchester, in thecounty of Lancaster, England, have invented a new and useful Pneumatic.Spring or Cushion, (for which I have obtained Provisional Protection inGreat Britain, No. 2,575, bearing date February 9, 1900,) of which thefollowing is a specification.

The improvement relates to air-cushions to be used as springs for thereduction of vibration, and has for its object to produce an efiectivespring of the character to be hereinafter described.

In order to make my improvement better derstood, I will refer to theaccompanying sheets of drawings, in which- Figures 1, 2, and 3 are sideelevations of deflated component parts of one form of cushion forming aportion of my invention. Fig. 4 is a cross-section of such completedcushion when inflated, and Fig. 5 is part of aplan view of Fig. 4. Fig.6 is side elevation of the infiated cushion and a container or frameworkby which the cushion isvheld in position and which framework in thisparticular case is suitable for attachment to the axle of a vehicle.Fig. 7 is an end view thereof, while Fig. 8 shows a portion of a sideview of the cushion, together with a modified form of container orframework, partly in section. Figs. 6, 7, and 8 are reduced in scale.

The same letters indicate corresponding parts wherever they occur.

In carrying out my invention I form the cushion by placing an air-tightindia-rubber or elastic bladder a, capable of having a suitable valveattached thereto,within a restraining-bag b, of canvas or other suitablematerial, the opening in which may be closed by lacings. In Fig. 2 a rowof holes I) for receiving the laces are to be seen near one edge 19 ofthe opening referred to, and above which edge an attached flap b isturned into the plane of View in order to show the hole I) for thepassage of the stem of the valve therethrough. This bladder andrestraining-bag I then place in an india-rubber or elastic cover 0,provided with thickened edges 0 around a fiat portion of the cover, withan opening in such portion to permit of the insertion of the" bladderand restraining-bag aforesaid.

In Figs. 6 and 7 the outer cover 0 is held by a container or frameworkd, the edges 0' of such cover being retained by the plate (1 and throughwhich plate the valve attached to the bladder of the cushion projects.As shown, the movement of the plate d and the top plate d supporting theweight of the vehicle, is controlled by the hinges d and d arranged atright angles, so that when the bottom plate 01 is fixed in manner wellunderstood upon the axle of the vehicle the plates d and d are only freeto move through one plane.

For the purpose of preventing to some ex-.

tent vibration being transmitted from the bottom plate (1 to the topplate 01 by way of the hinges insertions d of india-rubber or yieldingmaterial are shown at such hingeportions of the framework.

Instead of a container formed with hinges a container 9 may be providedwith guiderods, such as e in Fig. 8, and tofurther assist in preventingvibration passing from the bottom plate 6 to the plate a above itindia-rubber or elastic bushes, such as e are placed around the rods 6,which pass through holes in the bottom plate and are expanded laterallyby the tightening up of nuts, such as 6 on the rod e.

Having now particularly described and ascertained the nature of my saidinvention and in what manner the same is to be performed,

I declare that what I claim is-- 1. A pneumatic spring or cushionconsisting of a bladder a with a valve attached,

placed within a restraining-bag b and an outer cover 0, in combinationwith a container or framework of a suitable character for holding inposition the cushion of the particular kind described, for the purposeand in manner substantially as herein set forth.

2. A pneumatic spring or cushion consist ing of a bladder a with a valveattached, placed Within a restraining-bag b and an outer cover a, incombination with a container or framework (1 provided with hinges d and01 arranged at right angles, for the purpose and in manner substantiallyas herein set forth.

SHELDON HAROLD STUBBS.

Witnesses:

ARTHUR GADD, GEORGE FREDERICK GADD.

